6640436 has 12 divisors (see below), whose sum is σ = 12677280. Its totient is φ = 3018360.

The previous prime is 6640429. The next prime is 6640441. The reversal of 6640436 is 6340466.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6640399 and 6640408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75416 + ... + 75503.

It is an arithmetic number, because the mean of its divisors is an integer number (1056440).

Almost surely, 2^6640436 is an apocalyptic number.

It is an amenable number.

6640436 is a deficient number, since it is larger than the sum of its proper divisors (6036844).

6640436 is a wasteful number, since it uses less digits than its factorization.

6640436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150934 (or 150932 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 6640436 is about 2576.9043443636. The cubic root of 6640436 is about 187.9600413038.

The spelling of 6640436 in words is "six million, six hundred forty thousand, four hundred thirty-six".